Strange sequence of beeps

[delicolor]

My 64 plate Superb has developed a strange symptom.

 

Generally when shifting into reverse, I will hear four clicks followed by a long beep followed by a short beep. It isn't the same pitch as the reversing sensors.

 

I did change the radio to a Pioneer last year (from a chinese no brand one) but I didn't opt for the visual module to show air con state & reversing map, I didn't see the point.

 

The car has front sensors as well as rear which will sound in neutral so I suspect they may be aftermarket.

 

The symptom will sometimes do it whilst slow moving forwards. No error indications on the dash or maxidot.

 

It is quite a while until my next service so I was just wondering if this rang any bells with anyone.

 

Cheers,

 

Ian

[delicolor]

Having just had the Superb serviced, I am advised that the car is grumbling because it is aware that the front sensors are unauthorised non-warranty ones. (Apparently they are wired back to a box labelled laserline). I had a chinese car radio in the car from when I bought it which I recently replaced and wonder whether the alarm had been masked when the first radio had been coded which has now been lost.